| Business | Phone |
| Washington County Collector's 102 N Missouri St, Potosi 63664 | (573) 438-3441 |
| Washington County Probate Jdg 102 N Missouri St, Potosi 63664 | (573) 438-3691 |
| Washington County Soil & Water 103 N Missouri St, Potosi 63664 | (573) 438-9214 |
| Washington Juvenile Office 113 N Missouri St, Potosi 63664 | (573) 438-5860 |
| University Of Mo Extension Ctr 113 N Missouri St, Potosi 63664 | (573) 438-2671 |